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The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability that his score was 91 or higher

  • statistics - ,

    Use z-scores:

    z = (91 - 86)/5 = ?

    Once you calculate the z-score, check a z-table for the probability. (Remember that the problem is asking what is the probability the score was 91 or higher.)

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